Electronics Forum: pcb and grain and direction (Page 1 of 3)

small and good pick and place machine

Electronics Forum | Thu Sep 05 23:18:03 EDT 2013 | feiyangniao

There is a new toy I received today: a NeoDen TM-240A automatic desktop pick and place machine! I’ve kept my eyes on this baby for a quite a while, and finally decided to make a purchase last week. The shipping was very fast: DHL from China, a total

PCB Thickness and BLR

Electronics Forum | Wed Jul 24 09:54:49 EDT 2019 | amitthepcbguy

Typically, the reliability of PCBs suffers significantly due to the increase in aspect ratio. It is not preferred to opt for high thickness boards. However, I would like to point out that your assumption seems to be wrong as board layers do not direc

Aluminum and silica contamination

Electronics Forum | Wed Jan 12 13:42:19 EST 2011 | dwonch

Hi All, I'm hoping there is a PCB expert or two hanging around. We're having some solderability issue on our boards. The finish is ENIG but it doesn't seem to be related to the finish process itself. We did SEM and EDX analysis and found aluminum an

MPM Up2000 and SMEMA

Electronics Forum | Tue Sep 13 10:00:27 EDT 2016 | awhite

Switched out the mech. relay on the board loader, no change. Same behavior. Could not find a mech. relay on the printer... SMEMA wiring appears go directly to a PCB. And it is at that point that I run out of talent. If the machine weren't dedicate

Re: Voids and BGA

Electronics Forum | Sun Mar 01 15:52:13 EST 1998 | Earl Moon

From several months I am investigation about the VOIDS PERSENCE and his important as reliability. One question now is : It is possible that on the BGA components the voids are already present into the balls, before the mounting on the pcb ? I

Cleaning Machine and Chemistry

Electronics Forum | Mon Feb 19 11:36:39 EST 2001 | billschreiber

Hello Mark, I wish it were that simple so I could direct you to a particular manufacturer and stencil cleaner model. Unfortunately, there are several issues complicating the process of cleaning all these applications in one machine. First and fore

Re: Intermetallics and reflow profile

Electronics Forum | Wed May 03 20:24:22 EDT 2000 | Dave F

MF: I know of nothing that addresses your question directly. Let me suggest: * Technical types at your solder supplier should be able to help. * "Effect Of Intermetallic Compounds On The Thermal Fatigue Of Surface Mount Solder Joints" PL Tu, et a

Stencil and PCB Coplanarity measurement

Electronics Forum | Mon Apr 09 11:39:32 EDT 2018 | emeto

The easiest way to do without special tools is to use level. Check machine co-planarity on the conveyor rails in both directions(you can do that with rails down or rails up or both). Then check co-planarity on the stencil. If the level shows the sam

Re: Buying stenciling and pick and place equipement.

Electronics Forum | Mon Dec 20 13:39:08 EST 1999 | Wolfgang Busko

Hi Clarissa, seems to be a real start up situation you are in. For the printing there is IMO no need to buy any sophisticated automatic-vision-alignment-self-cleaning-inline-and-more-machine. Features you need: - adjustable in X-,Y-,Z-axis (individu

BGA ball and PCB pad

Electronics Forum | Fri Feb 27 11:33:32 EST 2004 | Bryan

Very strange question,but interesting.Is there anyone who have conducted any experiments to figure out the results?I made a profile board,one thermal couple on pad and other one drilled into the ball of BGA.the 2 points are perpendicular to conveyor

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